// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_STREAM_TRACK_HOST_BASE_H_
#define CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_STREAM_TRACK_HOST_BASE_H_

#include <stdint.h>

#include "base/compiler_specific.h"
#include "base/macros.h"
#include "content/common/content_export.h"
#include "ppapi/host/resource_host.h"
#include "ppapi/shared_impl/media_stream_buffer_manager.h"

namespace content {

class RendererPpapiHost;

class PepperMediaStreamTrackHostBase
    : public ppapi::host::ResourceHost,
      public ppapi::MediaStreamBufferManager::Delegate {
protected:
    PepperMediaStreamTrackHostBase(RendererPpapiHost* host,
        PP_Instance instance,
        PP_Resource resource);
    ~PepperMediaStreamTrackHostBase() override;

    enum TrackType {
        kRead,
        kWrite
    };
    bool InitBuffers(int32_t number_of_buffers,
        int32_t buffer_size,
        TrackType track_type);

    ppapi::MediaStreamBufferManager* buffer_manager() { return &buffer_manager_; }

    // Sends a buffer index to the corresponding MediaStreamTrackResourceBase
    // via an IPC message. The resource adds the buffer index into its
    // |buffer_manager_| for reading or writing.
    // Also see |MediaStreamBufferManager|.
    void SendEnqueueBufferMessageToPlugin(int32_t index);

    // Sends a set of buffer indices to the corresponding
    // MediaStreamTrackResourceBase via an IPC message.
    // The resource adds the buffer indices into its
    // |frame_buffer_| for reading or writing. Also see |MediaStreamFrameBuffer|.
    void SendEnqueueBuffersMessageToPlugin(const std::vector<int32_t>& indices);

    // ResourceMessageHandler overrides:
    int32_t OnResourceMessageReceived(
        const IPC::Message& msg,
        ppapi::host::HostMessageContext* context) override;

    // Message handlers:
    virtual int32_t OnHostMsgEnqueueBuffer(
        ppapi::host::HostMessageContext* context, int32_t index);

private:
    // Subclasses must implement this method to clean up when the track is closed.
    virtual void OnClose() = 0;

    // Message handlers:
    int32_t OnHostMsgClose(ppapi::host::HostMessageContext* context);

    RendererPpapiHost* host_;

    ppapi::MediaStreamBufferManager buffer_manager_;

    DISALLOW_COPY_AND_ASSIGN(PepperMediaStreamTrackHostBase);
};

} // namespace content

#endif // CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_STREAM_TRACK_HOST_BASE_H_
